A typical cell has a layer of negative charge on the inner surface of the cell wall and a layer of positive charg on the wall outside surface, thus making the cell wall a capacitor.

What is the capacitance of a 50 um diameter cell with a 7.o nm thick cell wall whose dielectric constant is 9.0?

Because the cell's diameter is much larger than the wall thickness, it is reasonable to ignore the curvature of the cell and think of it as a parallel-plate capacitor.

the answer is d

lies a supermassive black hole called sagittarius a*, or sgr a* for short.

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explanation:

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.